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M. A. Green, C. W. Rowley & G. Haller*
Princeton University

We use a method called Direct Lyapunov Exponent to identify coherent structures in a turbulent channel flow. The plane on the top is at a constant distance from the channel wall. In the lower two images, the channel walls are at the top and bottom. The top image is a plane seen by looking down the channel, and the bottom image is a plane seen from looking from the side of the channel. Structures are outlined in black, and are more dominant near the walls, as expected. See also hairpin vortex.

Green, M. A., Rowley, C. W. & Haller, G. Detection of Lagrangian coherent structures in three-dimensional turbulence, Journal of Fluid Mechanics, 572, 2007, 111-120.


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